Luther is blackmailed by Jenny's former madam and her heavies who threaten to kill the quirky teenager if he doesn't comply. Meanwhile he is called to investigate a series of strange, random murders. CAST: Idris Elba

Idris Elba stars as the near-genius Detective Chief Inspector John Luther. He returns to policing after the brutal death of his wife, struggling with his own demons and grappling with a different world of crime fighting.

Channel 2 next episode Friday May 9, 9.35 pm